[go: up one dir, main page]

WO2018230923A1 - Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé - Google Patents

Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé Download PDF

Info

Publication number
WO2018230923A1
WO2018230923A1 PCT/KR2018/006630 KR2018006630W WO2018230923A1 WO 2018230923 A1 WO2018230923 A1 WO 2018230923A1 KR 2018006630 W KR2018006630 W KR 2018006630W WO 2018230923 A1 WO2018230923 A1 WO 2018230923A1
Authority
WO
WIPO (PCT)
Prior art keywords
csi
reference signal
information
port groups
type reference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/006630
Other languages
English (en)
Korean (ko)
Inventor
김형태
강지원
박종현
박해욱
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to US16/619,856 priority Critical patent/US11271695B2/en
Priority to EP18817768.7A priority patent/EP3641251A4/fr
Publication of WO2018230923A1 publication Critical patent/WO2018230923A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for mapping between codewords and layers in a next generation communication system.
  • NR new radio access technology
  • Enhanced Mobile BroadBand eMBB
  • Ultra-reliable Machine-Type Communications uMTC
  • Massive Machine-Type Communications mMTC
  • a method for receiving a downlink signal by a terminal includes: information about two or more first type reference signal port groups from a network and information about two or more second type reference signal port groups. Receiving; Two or more codewords from two or more transmission points constituting the network, using the information on the two or more first type reference signal port groups and the information on the two or more second type reference signal port groups. Receiving the downlink signal, wherein the two or more first type reference signal port groups correspond to different transmission points, and the two or more second type reference signal port groups correspond to different codewords. It features.
  • a terminal in a wireless communication system which is an aspect of the present invention, a wireless communication module; And connected with the wireless communication module, receiving information about two or more first type reference signal port groups and information about two or more second type reference signal port groups from a network, wherein the two or more first type reference signals are received.
  • the terminal assumes that the antenna ports constituting each of the two or more first type reference signal port groups are the same channel status information-reference signal (CSI-RS) and quasi co-located (QCL). And receiving the downlink signal.
  • the terminal may receive information about a corresponding relationship between the two or more first type reference signal port groups and the two or more second type reference signal port groups.
  • the terminal receives two or more CSI-RSs from the network, reports rank information corresponding to each of the two or more CSI-RSs to the network, and the two or more first signals.
  • Information about type reference signal port groups and the information about the two or more second type reference signal port groups may be determined by the network based on the rank information.
  • the reference signal refers to DM-RS (DeModulation-Reference Signal).
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • 3 is a diagram for explaining a physical channel used in the 3GPP system and a general signal transmission method using the same.
  • 5 is a diagram illustrating a structure of a downlink radio frame used in the LTE system.
  • FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
  • FIG. 9 is a flowchart illustrating an example of receiving a downlink signal according to an embodiment of the present invention.
  • FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • a base station may be used as a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, and the like.
  • RRH remote radio head
  • TP transmission point
  • RP reception point
  • relay and the like.
  • LTE 3rd Generation Partnership Project Long Term Evolution
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • an E-UMTS is located at an end of a user equipment (UE), an eNode B (eNB), and a network (E-UTRAN) and connected to an external network (Access Gateway; AG). It includes.
  • the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
  • the cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission service to multiple terminals. Different cells may be configured to provide different bandwidths.
  • the base station controls data transmission and reception for a plurality of terminals.
  • For downlink (DL) data the base station transmits downlink scheduling information to inform the corresponding UE of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
  • the base station transmits uplink scheduling information to uplink UL data for uplink (UL) data and informs the corresponding time / frequency domain, encoding, data size, HARQ related information, and the like.
  • the core network may be composed of an AG and a network node for user registration of the terminal.
  • the AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
  • the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
  • the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
  • the physical layer is connected to a medium access control layer above it through a transport channel. Data moves between the medium access control layer and the physical layer through the transmission channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
  • the physical channel utilizes time and frequency as radio resources.
  • the physical channel is modulated in an orthogonal frequency division multiple access (OFDMA) scheme in downlink, and modulated in a single carrier frequency division multiple access (SC-FDMA) scheme in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
  • RLC radio link control
  • the RLC layer of the second layer supports reliable data transmission.
  • the function of the RLC layer may be implemented as a functional block inside the MAC.
  • the Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit IP packets such as IPv4 or IPv6 in a narrow bandwidth wireless interface.
  • PDCP Packet Data Convergence Protocol
  • the Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
  • the RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers (RBs).
  • RB means a service provided by the second layer for data transmission between the terminal and the network.
  • the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
  • the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
  • the downlink transmission channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message.
  • BCH broadcast channel
  • PCH paging channel
  • SCH downlink shared channel
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
  • RAC random access channel
  • SCH uplink shared channel
  • the logical channel mapped to the transmission channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and an MTCH (multicast). Traffic Channel).
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast. Traffic Channel
  • FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
  • the UE When the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the terminal may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • DL RS downlink reference signal
  • the UE Upon completion of the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S302).
  • PDSCH physical downlink control channel
  • PDCCH physical downlink control channel
  • the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
  • RACH random access procedure
  • the UE may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S303 and S305), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S304 and S306).
  • PRACH physical random access channel
  • a contention resolution procedure may be additionally performed.
  • FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
  • a radio frame has a length of 10 ms (327200 ⁇ Ts) and consists of 10 equally sized subframes.
  • Each subframe has a length of 1 ms and consists of two slots.
  • Each slot has a length of 0.5 ms (15360 x Ts).
  • the slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • one resource block includes 12 subcarriers x 7 (6) OFDM symbols.
  • Transmission Time Interval which is a unit time at which data is transmitted, may be determined in units of one or more subframes.
  • the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.
  • FIG. 5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
  • a subframe consists of 14 OFDM symbols.
  • the first 1 to 3 OFDM symbols are used as the control region and the remaining 13 to 11 OFDM symbols are used as the data region.
  • R0 to R3 represent reference signals (RSs) or pilot signals for antennas 0 to 3.
  • the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
  • the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
  • Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
  • the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
  • the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
  • the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in a control region based on a Cell ID (Cell IDentity).
  • One REG is composed of four resource elements (REs).
  • the RE represents a minimum physical resource defined by one subcarrier x one OFDM symbol.
  • the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
  • QPSK Quadrature Phase Shift Keying
  • the PHICH is a physical hybrid automatic repeat and request (HARQ) indicator channel and is used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted.
  • the PHICH consists of one REG and is scrambled cell-specifically.
  • ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
  • BPSK binary phase shift keying
  • a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
  • the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
  • the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
  • the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
  • n is indicated by the PCFICH as an integer of 1 or more.
  • the PDCCH consists of one or more CCEs.
  • the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
  • PCH paging channel
  • DL-SCH downlink-shared channel
  • Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted on the PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
  • Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
  • a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, frequency location) of "B” and a DCI format of "C", that is, a transmission format.
  • RTI Radio Network Temporary Identity
  • the terminal in the cell monitors, that is, blindly decodes, the PDCCH in the search region by using the RNTI information of the cell, and if there is at least one terminal having an "A" RNTI, the terminals receive and receive the PDCCH.
  • the PDSCH indicated by "B” and "C” is received through the information of one PDCCH.
  • FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
  • an uplink subframe may be divided into a region to which a Physical Uplink Control CHannel (PUCCH) carrying control information is allocated and a region to which a Physical Uplink Shared CHannel (PUSCH) carrying user data is allocated.
  • the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
  • the control information transmitted on the PUCCH includes ACK / NACK used for HARQ, Channel Quality Indicator (CQI) indicating a downlink channel state, RI (Rank Indicator) for MIMO, and scheduling request (SR), which is an uplink resource allocation request. There is this.
  • the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
  • channel state information (CSI) reporting will be described.
  • CSI channel state information
  • each of the base station and the terminal may perform beamforming based on channel state information in order to obtain a multiplexing gain (multiplexing gain) of the MIMO antenna.
  • the base station instructs the terminal to feed back the channel state information (CSI) for the downlink signal by assigning a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) to the terminal.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • CSI is largely classified into three types of information, such as a rank indicator (RI), a precoding matrix index (PMI), and a channel quality indication (CQI).
  • RI represents rank information of a channel, and means the number of streams that a UE can receive through the same frequency-time resource.
  • the RI is fed back to the base station at a longer period than the PMI and CQI values.
  • PMI is a value reflecting the spatial characteristics of the channel and represents the precoding matrix index of the base station preferred by the terminal based on a metric such as signal-to-interference and noise ratio (SINR).
  • SINR signal-to-interference and noise ratio
  • CQI is a value representing the strength of the channel, which means the reception SINR that can be obtained when the base station uses PMI.
  • the base station may configure a plurality of CSI processes to the UE, and receive and report the CSI for each CSI process.
  • the CSI process is composed of a CSI-RS resource for signal quality specification from a base station and an interference measurement (CSI-IM) resource for interference measurement, that is, an IMR (interference measurement resource).
  • CSI-IM interference measurement resource
  • the LTE-A system which is a standard of the next generation mobile communication system, is expected to support a CoMP (Coordinated Multi Point) transmission method, which was not supported in the existing standard, to improve the data rate.
  • the CoMP transmission scheme refers to a transmission scheme in which two or more base stations or cells cooperate with each other to communicate with a terminal in order to improve communication performance between a terminal and a base station (cell or sector) in a shaded area.
  • the terminal may simultaneously receive data from each base station that performs the CoMP transmission scheme, and combine the received signals from each base station to improve reception performance.
  • Joint Transmission JT
  • one of the base stations performing the CoMP transmission scheme may also consider a method for transmitting data to the terminal at a specific time point (DPS; Dynamic Point Selection).
  • the UE may receive data through one base station, that is, a serving base station, through beamforming.
  • each base station may simultaneously receive a PUSCH signal from the terminal (Joint Reception; JR).
  • JR Joint Reception
  • cooperative scheduling / beamforming scheme CoMP-CS / CB
  • only one base station receives a PUSCH, where the decision to use the cooperative scheduling / beamforming scheme is determined by the cooperative cells (or base stations). Is determined.
  • a PDSCH RE Mapping and Quasi-Co-Location Indicator (PQI) field is defined in DCI format 2D for transmission mode 10, which is a CoMP PDSCH transmission.
  • the PQI field is defined as a 2-bit size and indicates a total of four states, and the information indicated by each state is a parameter set for receiving a PDMP of CoMP scheme, and specific values are signaled in advance through an upper layer. do. That is, a total of four parameter sets can be signaled semi-statically through the RRC layer signal, and the PQI field of the DCI format 2D indicates one of the four parameter sets dynamically.
  • the information included in the parameter set includes the number of CRS antenna ports (crs-PortsCount), the frequency shift value of the CRS (crs-FreqShift), the MBSFN subframe configuration (mbsfn-SubframeConfigList), and the ZP CSI-RS configuration (csi-RS One or more of -ConfigZPId), PDSCH start symbol (pdsch-Start), and NZP (Non-ZP) CSI-RS Quasi Co-Location (QCL) information (qcl-CSI-RS-ConfigNZPId) information.
  • crs-PortsCount the number of CRS antenna ports
  • crs-FreqShift the frequency shift value of the CRS
  • mbsfn-SubframeConfigList MBSFN subframe configuration
  • ZP CSI-RS configuration csi-RS One or more of -ConfigZPId
  • PDSCH start symbol pdsch-Start
  • QCL between antenna ports means that a signal received from one antenna port by a large-scale property of a signal (or a wireless channel corresponding to the corresponding antenna port) that a terminal receives from one antenna port ( Or all or some of the broad characteristics of the wireless channel corresponding to the corresponding antenna port).
  • the wide range characteristics include Doppler spread associated with frequency offset, Doppler shift, average delay associated with timing offset, delay spread, and the like, and further, average gain ( average gain) may also be included.
  • the UE cannot assume that the wide range characteristics are the same between non-QCL antenna ports, that is, non-QCL (non quasi co-located) antenna ports. In this case, the UE must independently perform a tracking procedure for acquiring a frequency offset and a timing offset for each antenna port.
  • the UE may calculate a reference signal received power (RSRP) measurement value for each of the QCL antenna ports as an average value.
  • RSRP reference signal received power
  • the terminal when the terminal receives DM-RS based downlink data channel scheduling information, for example, DCI format 2C, through a PDCCH (or E-PDCCH), the terminal receives a DM-RS sequence indicated by the scheduling information. It is assumed that data demodulation is performed after performing channel estimation on the PDSCH.
  • DM-RS based downlink data channel scheduling information for example, DCI format 2C
  • PDCCH or E-PDCCH
  • the UE estimates from its CRS antenna port when the channel is estimated through the corresponding DM-RS antenna port.
  • DM-RS-based downlink data channel reception performance can be improved by applying the large-scale properties of the wireless channel.
  • the UE performs CSI-RS antenna of the serving cell when channel estimation is performed through the corresponding DM-RS antenna port.
  • DM-RS based downlink data channel reception performance can be improved by applying large-scale properties of the radio channel estimated from the port.
  • mmW millimeter wave
  • the wavelength is shortened to allow the installation of multiple antenna elements in the same area.
  • the wavelength is 1 cm, and a total of 64 (8x8) antenna elements in a 2D (dimension) array form at 0.5 lambda intervals can be installed in a panel of 4 by 4 cm. Therefore, recent trends in the mmW field have attempted to increase the coverage or increase the throughput by increasing the beamforming gain using a plurality of antenna elements.
  • TXRU Transceiver Unit
  • independent beamforming is possible for each frequency resource.
  • TXRU Transceiver Unit
  • the analog beamforming method has a disadvantage in that only one beam direction can be made in the entire band and thus frequency selective beamforming cannot be performed.
  • a hybrid BF having B TXRUs, which is smaller than Q antenna elements, may be considered as an intermediate form between digital BF and analog BF.
  • the beam directions that can be simultaneously transmitted are limited to B or less.
  • 1 shows examples of a connection scheme of a TXRU and an antenna element.
  • FIG. 1A shows how a TXRU is connected to a sub-array.
  • the antenna element is connected to only one TXRU.
  • FIG. 7B shows how the TXRU is connected to all antenna elements.
  • the antenna element is connected to all TXRUs.
  • W denotes a phase vector multiplied by an analog phase shifter. That is, the direction of analog beamforming is determined by W.
  • the mapping between the CSI-RS antenna port and the TXRUs may be 1-to-1 or 1-to-multi.
  • the fifth generation NewRAT considers a self-contained subframe structure as shown in FIG. 2.
  • 2 is an example of a self-contained subframe structure.
  • the hatched area represents the downlink control area, and the black part represents the uplink control area.
  • An area without an indication may be used for downlink data transmission or may be used for uplink data transmission.
  • the feature of such a structure is that downlink transmission and uplink transmission are sequentially performed in one subframe, thereby transmitting downlink data and receiving uplink ACK / NACK in the subframe. As a result, when a data transmission error occurs, the time taken to retransmit data is reduced, thereby minimizing the latency of the final data transfer.
  • a time gap is required for a base station and a UE to switch from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode.
  • some OFDM symbols (OFDM symbols) at the time of switching from downlink to uplink in a self-contained subframe structure are set to a guard period (GP).
  • subframe type configurable / configurable in a system operating based on NewRAT at least the following four subframe types may be considered.
  • the structure of the DM-RS transmitted only in the OFDM symbol in front of the slot is reflected. This is called a slot loaded DM-RS only structure.
  • the DM-RS is transmitted in the front OFDM symbol of the slot, and the DM-RS is also implemented in the additional OFDM symbol of the slot is also implemented. That is, an additional DM-RS is added in the slot shear allocation structure.
  • the base station can indicate the mapping information between the CW and the layer to be used when receiving the data to the UE, the UE can also feed back the preferred mapping information between the CW and the layer with the CSI (channel status information).
  • the base station may provide mapping information between the CW and the layer through RRC layer signaling / MAC layer signaling / DCI, or may provide hierarchically by using two or more signaling. For example, configurable mapping rules between CW and layers may be provided through RRC layer signaling as a candidate set, and DCI may indicate which CW and layer mapping rules to use among candidate sets.
  • the mapping rules between CW and layers can be changed dynamically with less DCI overhead.
  • the rank 5 CW and the layer-to-layer mapping rule (2, 3) are two layers from the front of layers 0 to 4, layers 0 and 1 are mapped to CW1, and the remaining three layers 2 to 4 are CW2.
  • the CW-to-layer mapping rule (3,2) of rank 5 means that three layers from the front, layers 0 to 2, are mapped to CW1, and the remaining two layers, layers 3 and 4, are mapped to CW2. do.
  • the base station may also inform the CW and the layer-to-layer mapping information (hereinafter, C2L) in order to indicate a DM-RS port group for data reception of the UE.
  • C2L layer-to-layer mapping information
  • group 1 may indicate DM-RS port 0 and DM-RS port 1 to indicate C2L (2,3).
  • group 2 indicates DM-RS port 2 to DM-RS port 4, CW1 corresponds to group 1 and CW2 is defined to correspond to group 2.
  • the DM-RS port group may be defined in two types. Type 1 groups into DM-RS ports to which the same QCL and the same rate matching are applied, and type 2 groups into DM-RS ports for layers constituting the same CW. For example, when three TPs, that is, TP1 to TP3 perform downlink transmission in total rank 7, using independent layer joint transmission (ILJT), TP1 to TP3 are rank 2, rank 2, and rank, respectively. Send data to 3. In addition, TP1 and 2 transmit different layers corresponding to the same CW, and TP3 transmits layers corresponding to different CWs.
  • IJT independent layer joint transmission
  • TP1 and 2 transmit different layers corresponding to the same CW
  • TP3 transmits layers corresponding to different CWs.
  • the base station informs the UE about the type 1 DM-RS port group and how the type 1 DM-RS port group is mapped to the type 2 DM-RS port group. For example, type 1 DM-RS port group 1 and type 1 DM-RS port group 2 are mapped to type 2 DM-RS port group 1, and type 1 DM-RS port group 3 is type 2 DM-RS port group. Notice that it is mapped to 2.
  • the type of the DM-RS port group may be indicated by the base station to the UE. That is, when the base station indicates the type 1, different QCL and rate matching may be applied for each DM-RS port group, and the mapping between the CW and the layer may be performed by the mapping rule between the CW and the layer determined irrespective of the DM-RS port group. Is determined accordingly.
  • the DM-RS port group and the CW correspond to 1: 1, and the same QCL and rate matching are applied regardless of the DM-RS port group.
  • the type 1 DM-RS port group and the type 2 DM-RS port group may be indicated simultaneously, in which case different QCL and rate matching may be applied to each DM-RS port group, and each DM-RS port group It can be mapped with other CWs.
  • Type 2 DM-RS port groups can be used for flexible mapping between CW and layer in a single TP situation. That is, when one TP transmits one DCI and one PDSCH corresponding thereto, two type 2 DM-RS port groups are informed to the UE, and the type 2 DM-RS port group 1 corresponds to CW1 and a type 2 DM. RS port group 2 promises to correspond to CW2. Accordingly, MCS / RV / NDI, which is control information corresponding to each CW of DCI, is divided into MCS / RV / NDI for Group 1 and MCS / RV / NDI for Group 2.
  • the UE uses MCS / RV / NDI for DM-RS port group 1 when receiving data for DM-RS port group 1, and DM-RS for receiving data for DM-RS port group 2 Use MCS / RV / NDI for port group 2. Since all transmissions are from a single TP, all DM-RS ports assume QCL with the same CSI-RS.
  • Report setting 1 RI1, PMI1, CQI, mapping between RI and CW
  • each RS setting is linked 1: 1 with an individual report setting.
  • the mapping between CQI, RI, and CW is additionally set in report setting 1, which is a representative report setting.
  • the base station indicates through separate signaling that the first option configuration method is CSI measurement and reporting for ILJT / CoMP, and the UE measures and reports CoMP CSI according to the following method. That is, the base station indicates that report setting 1 to report setting 3 are bound to the report setting for CoMP, where the CSI calculation indicates to follow the scheme proposed below.
  • the representative report setting is set in the bundled report settings so that the mapping information between CQI and RI and CW can be reported in the representative report setting.
  • the mapping between the RI and CW can be sent with the CSI when triggering the aperiodic CSI report, and sent with the same period as the RI during periodic CSI reporting, or set as a multiple of the RI period to be reported in a longer term than the RI. Can be.
  • an independent subframe offset is indicated from the base station to prevent collision with other CSI.
  • two CSI information may be jointly encoded or CSI-RS aggregation information may be reported with priority.
  • the base station instructs the UE of the mapping relationship between the RI and the CW and the UE calculates the CSI accordingly.
  • the UE calculates the optimal CSI assuming that ILJT is performed on each channel of CSI-RS 1 to CSI-RS 3.
  • the number of layers and PMI for the channel of CSI-RS i are reported as RI i and PMI i, respectively.
  • CQI is achievable when data applying RI i and PMI i are simultaneously transmitted to each channel of CSI-RS i. Calculate the CQI value. Since there are one CQI for each CW, a maximum of two can be reported. Since a single CW in the total rank 4 or less and 2 CW in the total rank 5 or more, one or two CQIs are determined according to the rank.
  • the total rank means the total rank transmitted to the JT.
  • the total rank is 5 or more, there are two CWs. Therefore, it is necessary to additionally indicate which CW's layer belongs to which CW, and a mapping indicator between RI and CW is required for this purpose. For example, if the total rank is 5 and RI1 to RI3 are 2, 2, and 1, respectively, the UE reports that RI1, which is the number of layers to be transmitted by TP1, is mapped to CW1, and RI2 and RI3 are mapped to CW2. It transmits CW1 in this rank 2 and informs that TP2,3 together indicate CW 2 in rank 3.
  • TP3 indicates CW 2 in rank 1.
  • CQI 1 (CQI corresponding to CW1)
  • CQI 1 (CQI corresponding to CW1) is assumed to be the desired layer as RI connected to CW 1
  • CQI is calculated based on SINR based on the remaining layers.
  • CQI corresponding to CW2 the CQI is calculated based on the SINR, which assumes the desired layers as RIs connected to CW 2 and the remaining layers as interference.
  • CQI may be defined for each CSI-RS transmitted by each TP participating in the NC JT regardless of the total rank. Therefore, in the example of the first option in which three TPs participate in the NC JT, RI i, PMI i, and CQI i for CSI-RS i are defined and reported, respectively.
  • CQI i means CQI that can be achieved when RI i layers are transmitted through PMI i precoding through the channel of CSI-RS i.
  • the interference signal is CSI-RS other than CSI-RS i, that is, CSI.
  • the CQI is calculated assuming that as many layers as RI j are transmitted through precoding of PMI j through the channel of RS j.
  • an interference signal is assumed to have RI 2 layers transmitted through the channel of CSI-RS 2 through PMI 2 precoding, and additionally, the interference signal is transmitted through the channel of CSI-RS 3.
  • CQI is calculated.
  • mapping indicator between RI and CW is additionally required, in order to prevent an increase in control channel overhead due to a mapping indicator between RI and CW, the following is proposed.
  • the UE sets only two RI values to non-zero values and the other RI values to zero. Since there are two non-zero RIs, there can always be 1: 1 mapping with non-zero RI layers and CW, so a mapping indicator between RI and CW is unnecessary. Or, if the total rank is 5 or more, the UE proposes to set at most two RI values to non-zero values. That is, there may be one or two RIs that are not zero. If there is one non-zero RI, it follows the mapping between the CW and the layer of the existing LTE. If there are two non-zero RIs, the CW and the non-zero RI layers may always be 1: 1 mapped.
  • the structure uses two CWs from rank 5, but the present invention may be equally applied based on rank N instead of rank 5 in the structure using ranks N to 2 CWs.
  • the above description assumes a structure in which one data signal is transmitted through 2 CW at maximum, but is applicable to a structure transmitted through 3 CW at maximum. In this case, mapping information between RI and CW is unnecessary and RI i is CW. Fixed to i and mapped. The CQI calculation scheme in the first option applies equally to the remaining options.
  • the UE can feedback that TP i does not participate in CoMP transmission, and, if the system complexity is limited so that up to two TPs can participate in CoMP transmission, (Ie, RI1, RI2, RI3) It is desirable to limit the UE operation so that at most two RIs only feed back a non-zero value.
  • DPS Dynamic Point Selection
  • a CSR Codebook subset restriction
  • Report setting 1 RI1, PMI1, RI2, PMI2, RI3, PMI3, CQI, mapping between RI and CW
  • the second option has multiple RS settings linked to one report setting, but the CSI calculation and reporting work the same as the first option.
  • the UE selects up to two TPs among three TPs, and calculates and feeds back CSI of 2 TP CoMP.
  • Two TPs can be selected through CRI 1 and CRI 2, and RI i and PMI i indicate rank and PMI applied to the channel of CSI-RS selected as CRI i.
  • CRI rank and PMI applied to the channel of CSI-RS selected as CRI i.
  • CQI is calculated by 1: 1 fixed mapping from RI1-> CW1 and RI2-> CW2. That is, CQI 1 (CQI corresponding to CW1) is an interference layer in which RI1 layers to which PMI1 is applied to a CSI-RS channel selected as CRI 1 are transmitted to a desired layer and PMI2 is applied to a CSI-RS channel selected to CRI 2. Calculate based on SINR when transmitted to
  • CQI 2 (CQI corresponding to CW2) is a CSI-RS channel selected as CRI 2 and RI2 layers applied with PMI2 are transmitted to a desired layer, and RI1 layers applied PMI1 to a CSI-RS channel selected as CRI 1 are transmitted to an interference layer.
  • RI1 It also restricts RI1 to always be equal to or larger than RI2. As a result, C2L (l, k) and C2L (k, l) do not need to be distinguished, thereby reducing feedback overhead.
  • the UE selects a CRI where RI 1 of CRI 1 is equal to or greater than RI 2 of CRI 2.
  • RS setting 2 (CSI-RS2, IMR2) for TP2 and TP3
  • TP2 and 3 perform coherent JT for transmitting the same layer together
  • TP1 performs TP2,3 and ILJT.
  • the base station aggregates N2 CSI-RS ports and N3 CSI-RS ports transmitted from TP2 and TP3 and configures CSI-RS 2 composed of N2 + N3 CSI-RS ports in RS setting 2.
  • the UE obtains channel information when TP2,3 performs coherent JT from the CSI-RS 2 (UE transparently).
  • the CQI calculates achievable CQI value when data applying RI i and PMI i are simultaneously transmitted to each CSI-RS i channel. If RI1 + RI2 is 5 or more, 2CW transmission is performed. In this case, since there are two RIs, RI1 is fixedly mapped to CW1 and RI2 is fixedly mapped to CW2 to calculate CQI. That is, CQI 1 (ie, CQI corresponding to CW1) is calculated as follows. Based on the SINR when the RI1 layers to which PMI1 is applied to the CSI-RS1 channel are transmitted to the desired layer and the RI2 layers to which PMI2 is applied to the CSI-RS2 channel are transmitted to the interference layer.
  • CQI 2 (ie, CQI corresponding to CW2) is based on SINR when RI2 layers with PMI2 applied to the CSI-RS2 channel are transmitted to the desired layer and RI1 layers with PMI1 applied to the CSI-RS1 channel are transmitted to the interference layer.
  • Report setting 1 RI1, PMI1, RI2, PMI2, CQI, CSI-RS aggregation information
  • the UE regenerates a total of two CSI-RSs by selecting which of the three CSI-RSs to aggregate. For example, CSI-RS 1 and 2 are aggregated to regenerate CSI-RS 1 ', and CSI-RS 3 is regenerated to CSI-RS 2'.
  • the regenerated CSI-RS 1 'and CSI-RS 2' show the channels transmitted by the virtual TP1 and the virtual TP2, respectively, and the UE calculates the CSI that can be achieved when the virtual TP1 and the virtual TP2 perform the ILJT. And report.
  • CQI is calculated by 1: 1 fixed mapping from RI1-> CW1 and RI2-> CW2. That is, CQI 1 (CQI corresponding to CW1) is SINR when RI1 layers to which PMI1 is applied to the CSI-RS1 'channel are transmitted to the desired layer and RI2 layers to which PMI2 is applied to the CSI-RS2' channel are transmitted to the interference layer. Calculate based on
  • CQI 2 (CQI corresponding to CW1) is based on SINR when RI2 layers having PMI2 applied to the CSI-RS2 'channel are transmitted to the desired layer and RI1 layers having PMI1 applied to the CSI-RS1' channel are transmitted to the interference layer.
  • the UE reports the CSI-RS aggregation information to the base station together with the CSI.
  • the CSI-RS aggregation information may be sent together with the CSI when the aperiodic CSI report is triggered, and may be reported with the same period as the RI or set as a multiple of the RI period when the periodic CSI reporting is reported in longer-term than the RI.
  • Report setting 1 RItot, RI1, PMI1, RI2, PMI2, CQI
  • the ranks of CSI-RS 1,2,3 can be 3,1,1, 1,2,2, 2,1, It may be two.
  • the seventh option corresponds to the case where two TPs perform ILJT.
  • the UE calculates the optimal CSI when ILJTR is performed on each channel of the CSI-RSs 1,2.
  • the number of layers and the PMI for the channel of the CSI-RS i are reported as RI i and PMI i, respectively, and the CQI can be achieved when the data applying RI i and PMI i are simultaneously transmitted to the channels of the CSI-RS i. Calculate one CQI value.
  • CQI 2 (CQI corresponding to CW1) is calculated based on the SINR when RI2 layers with PMI2 applied to the CSI-RS2 channel are transmitted to the desired layer and RI1 layers with PMI1 applied to the CSI-RS1 channel are transmitted to the interference layer. do.
  • NC JT may be implemented by transmitting each TRP (Transmission Reception Point) simultaneously with different PDSCHs and different DCIs, or multiple TRPs transmit one PDSCH and one representative TRP transmits a DCI for the PDSCH. It can be implemented by transmitting.
  • the former is called a multiple DCI based non-coherent (NC) JT and the latter is called a single DCI based NC JT.
  • N 4
  • the UE calculates CSI by assuming mapping between different CWs and layers depending on whether it is a single DCI-based NC JT or a multiple DCI-based NC JT. Therefore, the UE should be instructed from the base station whether it is a single DCI-based NC JT or multiple DCI-based NC JT.
  • the base station sets one report setting and links the CSI-RS resources transmitted by each TRP to the one report setting.
  • the base station sets N report settings corresponding to N TRPs participating in the NC JT and connects the N CSI-RS resources transmitted by the N TRPs 1: 1 with the report settings. .
  • Each TRP participating in the NC JT basically transmits different data layers on the same frequency time resource. This is called a fully overlapped case. Meanwhile, in more advanced NC JT, data transmitted by each TRP may overlap in some frequency time resources, but may not overlap in some resources. For example, when TP1 transmits data at RB 1,2 and TP2 at RB 2,3, two TPs transmit data at RB2, but only one TP transmits data at the other RB. This is called a partially overlapped case.
  • the CSI assuming a complete overlapping case and a CSI assuming a partial overlapping case are different from each other, and it is preferable that the base station reports a CSI assuming a full overlapping case when the base station completes a final overlapping case.
  • the base station should inform whether the UE assumes a full overlap case or a partial overlap case when calculating the CSI, and how and how much frequency time resources should be partially overlapped if the partial overlap case is assumed. Should be informed. More simply, the UE may determine this assumption itself and report what assumption it has made to the base station along with the CSI. This assumption may be set by the base station via the report setting or may be indicated through the aperiodic CSI reporting triggering field in the DCI.
  • the base station may transmit the CSI-RS only to some RBs.
  • TP1 and TP2 transmit CSI-RS for the same frequency domain (eg RB), and for the partial overlap case, TP1 and TP2 partially overlap in the frequency domain (eg RB).
  • Transmit CSI-RS Specifically, CSI-RS 1 transmitted by TP1 is transmitted in RB 1,2 and CSI-RS 2 transmitted by TP2 is transmitted in RB 2,3.
  • the UE assumes that all data transmitted by TP1 and 2 exists for RB2 with CSI-RS overlapped, and that RB1 without CSI-RS overlaps with only data transmitted by TP1 and that RB3 has only data transmitted by TP2.
  • the base station performs resource allocation for the NC JT data in advance, and the transmission frequency region of the CSI-RS of each TP is determined according to the resource allocation. Since resource allocation is changed dynamically, it is preferable to use aperiodic CSI-RS.
  • the base station may indicate interference to the partial band (CSI-RS) and the fragment band or the MR (measurement restriction) of the channel to the UE through the following RRC signaling.
  • CSI-RS partial band
  • MR measurement restriction
  • the base station is said that TP0 corresponding to CSI-RS0 transmits data for RB 0, TP1 corresponding to CSI-RS 1 transmits data for RB 2, and TP 0 and TP1 simultaneously transmit data for RB1.
  • the above configuration is instructed to the UE to receive the CSI report under the assumption. That is, the UE reports the CSI for the RB 0 through the report setting 0, and measures the channel using the CSI-RS 0 transmitted through the RB 0 and 1.
  • IMR is omitted in the resource setting, IMR may be configured together with the RS band in the same manner as in CSI-RS.
  • the UE reports CSI for RB 2 through report setting 1 and measures channel using CSI-RS 1 transmitted over RB 1,2.
  • IMR may be configured together with the RS band in the same manner as in CSI-RS.
  • the UE reports the CSI for RB 1 through report setting 2 and measures the channel using CSI-RS 0 transmitted through RB 0, 1 and CSI-RS 1 transmitted through RB 1,2. That is, CSI is assumed when TP 0 and TP1 are supposed to transmit data at the same time.
  • IMR may be set together with the RS band in the same manner as in CSI-RS.
  • the UE can calculate and report CSI independently for the three report settings.
  • the base station may transmit different PDSCHs and corresponding different DCIs for each of RBs 0 to 2. That is, a total of three PDSCHs and three DCIs are transmitted. However, in this case, since DCI overhead increases, in order to prevent this, transmitting only one DCI / PDSCH per TP and transmitting a total of two DCIs and two PDSCHs, or a total of one DCI and one PDSCH desirable.
  • report settings 0 and 2 configured for CSI-RS 0 in resource setting should report CSI for the same PDSCH
  • At least RI and CQI must report the same value.
  • PMI should be set to a different value because the interference environment is different depending on whether or not two TPs transmit data at the same time.To reduce CSI reporting overhead, set W1 to the same value and W2 to different values. Can be set to a value.
  • report settings 1 and 2 configured for CSI-RS 1 in resource settings must report CSI for the same PDSCH, at least RI and CQI must report the same value. As a result, at least RI and CQI should report the same value for report settings 0, 1, and 2.
  • the base station should inform the UE whether to report the independent CSI by interpreting each of the report settings 0, 1, and 2 independently, or whether to calculate a single CSI with a dependency. If a dependency is set for a specific CSI (meaning a specific CSI among RI, PMI, CQI, CRI, etc.), the UE calculates the CSI in consideration of this.
  • a dependency is set in report setting 0,1
  • the UE calculates the CSI achievable when data is received via CSI-RS 1 for RB 2 and at the same time as data is received via CSI-RS 1 for RB2. And report.
  • the UE receives data through CSI-RS 0 for RB 0 and at the same time through CSI-RS 1 for RB2, and at the same time with CSI in RB 1 Compute and report the CSI achievable when different data layers are received via RS 0,1.
  • report setting 0 reports CSI achievable when data is received via CSI-RS 0 channel transmitted to RB 0 and report setting 1 via CSI-RS 1 channel transmitted to RB 2.
  • Report setting 2 reports the CSI achievable when different data layers are received on channels CSI-RS 2 and 3 sent to RB 1.
  • the base station sets each of the CSI-RSs 2 and 3 to the same port and the same RE pattern as the CSI-RS0 and 1.
  • the CSI-RS frequency allocation in the above proposals is limited to a specific RB, the actual multiple TRP resource allocation does not need to match this. That is, the frequency allocation of the CSI-RS is only allocation for CSI calculation, but the base station may perform final data scheduling differently. For example, even if a base station receives a CSI report on a channel measured through a CSI-RS transmitted in a narrow band, the base station can perform wideband scheduling to the UE using the CSI.
  • the interference in SINR2i for the i-th layer of TP2 consists of the remaining layers of TP2 and all layers of TP1 except the i-th layer of TP2. At this time, the interference power received from the layer of TP1 during the interference is scaled by the IF value to calculate the CSI.
  • the CSI-RS is transmitted in full band, but the BS can indirectly know the PDSCH transmission area assumed in the CSI calculation by notifying the UE of the channel measurement range.
  • CSI-RS 0, 1 is transmitted in full band, but report setting 0 associated with CSI-RS 0 indicates MR as RB 0, 1, and report setting 1 associated with CSI-RS 1 indicates MR as RB 1,2. Instruct.
  • the UE calculates the CSI assuming that only the TP 0 transmits the data layer in RB 0, only the TP 0,1 transmits the data layer in RB 1, and only the TP1 transmits the data layer in RB 2.
  • the codebook (ie PMI) to be reported for each report setting can be set independently.
  • the type 2 codebook For example, if TP 0 performs JT and performs MU (Multi-User) MIMO for its own cell, set the type 2 codebook to report setting 0 and report setting 0 if TP1 does not perform MU MIMO. Sets the Type 1 codebook.
  • the report setting for CoMP may be limited to not set the type 2.
  • the base station instructs the UE to the upper layer about whether to operate the fully overlapped NC JT and the partially overlapped NC JT, and the UE can calculate and report the CSI feedback accordingly.
  • the operation of the final data transmission may be left to the base station to instruct the UE only whether to perform CSI feedback for the fully overlapped NC JT or CSI feedback for the partially overlapped NC JT.
  • the base station can effectively perform MCS configuration by instructing the UE of subband (SB) CSI reporting.
  • SB subband
  • the base station uses MCS using CSI of SB2.
  • SB 1 and 3 three CSI report settings are set because a single TP needs to report the CQI of data transmission.
  • Report setting 1 calculates CSI by performing channel measurement with CSI-RS of TP1.
  • Report setting 2 calculates CSI for NC JT by performing channel measurement with CSI-RS of TP1 and CSI-RS of TP2.
  • 3 calculates CSI by performing channel measurement with CSI-RS of TP2.
  • the base station sets one MCS (eg, taking an average) using the CQI of report setting 1 and the CQI of report setting 2 when setting the MCS for SB1,2.
  • the base station sets one MCS (for example, by taking an average) using the CQI of the report setting 2 and the CQI of the report setting 3. Since the number of layers in SB 1 and SB 2 must be the same, and the number of layers in SB 2 and SB 3 must be the same, the RI inheritance relationship must be established so that the same RI is set between report setting 1 and report setting 2. . Likewise, RI inheritance relationships must be established between report settings 2 and 3.
  • FIG. 9 is a flowchart illustrating an example of receiving a downlink signal according to an embodiment of the present invention.
  • a terminal receives information about two or more first type DM-RS port groups and information about two or more second type DM-RS port groups from a network.
  • the two or more first type DM-RS port groups correspond to different transmission points
  • the two or more second type DM-RS port groups correspond to different codewords.
  • the terminal uses two or more pieces of first type DM-RS port groups and two or more types of second type DM-RS port groups to configure the network.
  • the downlink signal under the assumption that the antenna ports constituting each of the two or more first type DM-RS port groups are the same channel status information (CSI-RS) and quasi co-located (QCL).
  • CSI-RS channel status information
  • QCL quasi co-located
  • the terminal receives two or more CSI-RSs from the network, reports rank information corresponding to each of the two or more CSI-RSs, to the network.
  • the information about the first type DM-RS port groups and the information about the two or more second type DM-RS port groups may be determined by the network based on the rank information.
  • FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • the communication apparatus 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050.
  • the communication device 1000 is illustrated for convenience of description and some modules may be omitted.
  • the communication apparatus 1000 may further include necessary modules.
  • some modules in the communication apparatus 1000 may be classified into more granular modules.
  • the processor 1010 is configured to perform an operation according to an embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 1010 may refer to the contents described with reference to FIGS. 1 to 9.
  • the memory 1020 is connected to the processor 1010 and stores an operating system, an application, program code, data, and the like.
  • the RF module 1030 is connected to the processor 1010 and performs a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. To this end, the RF module 1030 performs analog conversion, amplification, filtering and frequency up-conversion, or a reverse process thereof.
  • the display module 1040 is connected to the processor 1010 and displays various information.
  • the display module 1040 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), or a ganic light emitting diode (OLED).
  • the user interface module 1050 is connected to the processor 1010 and may be configured with a combination of well-known user interfaces such as a keypad, a touch screen, and the like.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de réception d'un signal de liaison descendante par un terminal dans un système de communication sans fil. Spécifiquement, le procédé comprend les étapes consistant à : recevoir, en provenance d'un réseau, des informations concernant au moins deux groupes de ports de signal de référence de premier type et des informations concernant au moins deux groupes de ports de signal de référence de second type ; et recevoir, en provenance d'au moins deux points de transmission constituant le réseau, un signal de liaison descendante comprenant au moins deux mots de code à l'aide des informations concernant lesdits deux groupes de ports de signal de référence de premier type et les informations concernant lesdits deux groupes de ports de signal de référence de second type, lesdits deux groupes de ports de signal de référence de premier type correspondant à différents points de transmission, et lesdits deux groupes de ports de signal de référence de second type correspondant à différents mots de code.
PCT/KR2018/006630 2017-06-14 2018-06-12 Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé Ceased WO2018230923A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/619,856 US11271695B2 (en) 2017-06-14 2018-06-12 Method for mapping between codeword and layer in next generation communication system and apparatus therefor
EP18817768.7A EP3641251A4 (fr) 2017-06-14 2018-06-12 Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US201762519794P 2017-06-14 2017-06-14
US62/519,794 2017-06-14
US201762524586P 2017-06-25 2017-06-25
US62/524,586 2017-06-25
US201762536438P 2017-07-24 2017-07-24
US62/536,438 2017-07-24
US201762557081P 2017-09-11 2017-09-11
US62/557,081 2017-09-11

Publications (1)

Publication Number Publication Date
WO2018230923A1 true WO2018230923A1 (fr) 2018-12-20

Family

ID=64659953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2018/006630 Ceased WO2018230923A1 (fr) 2017-06-14 2018-06-12 Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé

Country Status (3)

Country Link
US (1) US11271695B2 (fr)
EP (1) EP3641251A4 (fr)
WO (1) WO2018230923A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110463128B (zh) * 2017-03-24 2022-10-18 苹果公司 用于CoMP的DM-RS分组和CSI报告
EP4422111A3 (fr) * 2018-02-16 2024-12-04 Sony Group Corporation Appareil et procédés de télécommunications
CN110933747B (zh) * 2018-09-19 2021-12-03 华为技术有限公司 一种资源配置方法及通信装置
CN110535590B (zh) 2018-09-27 2023-04-11 中兴通讯股份有限公司 数据发送、接收方法、装置、通信设备、系统及存储介质
WO2020146853A1 (fr) * 2019-01-11 2020-07-16 Apple Inc. Relaxation temporelle de traitement d'équipement d'utilisateur pour réception de pdsch nc-jt multi-dci
CN119054314A (zh) * 2022-04-29 2024-11-29 高通股份有限公司 用于报告多发送接收点相干联合发送信道状态信息的端口组

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110026622A1 (en) * 2009-07-30 2011-02-03 Qualcomm Incorporated Hybrid automatic repeat request operation and decoding status signaling for uplink multiple-input multiple-output
US20120300709A1 (en) * 2010-02-11 2012-11-29 China Academy Of Telecommunications Technology Method of and apparatus for mapping to demodulation reference signal port
US20130070732A1 (en) * 2010-02-19 2013-03-21 Lg Electronics Inc. Method and apparatus for mapping a plurality of layers to a plurality of antenna ports in a wireless communication system
US20130265955A1 (en) * 2012-04-06 2013-10-10 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving channels in mobile communication system supporting massive mimo
US20150215908A1 (en) * 2012-08-31 2015-07-30 Lg Electronics Inc. Method and device for receiving downlink signal in wireless communication system

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102428682B (zh) * 2009-04-27 2014-12-17 黑莓有限公司 用于mimo的混合-qrd-sic及不平衡mcs系统和方法
BR112013017480B1 (pt) * 2011-01-07 2022-06-14 Interdigital Patent Holdings, Inc Método, sistema e aparelho para recepção por canal compartilhado de transmissão por downlink em transmissões de multiponto cooperativas
KR102585652B1 (ko) * 2011-01-07 2023-10-05 인터디지탈 패튼 홀딩스, 인크 다중 송신 포인트의 채널 상태 정보(csi) 전달
CN103891162B (zh) * 2011-10-19 2017-10-03 Lg电子株式会社 监测控制信道的方法和使用该方法的无线装置
US8953699B2 (en) * 2011-11-07 2015-02-10 Google Technology Holdings LLC Method and apparatus for CSI feedback for joint processing schemes in an orthogonal frequency division multiplexing communication system with coordinated multi-point transmission
PL2777198T3 (pl) * 2011-11-09 2016-06-30 Ericsson Telefon Ab L M Raportowanie CSI dla zbioru zasobów CSI-RS
CN103581090B (zh) * 2012-07-26 2016-12-28 华为技术有限公司 导频信号发送方法和装置
US10098105B2 (en) * 2015-09-14 2018-10-09 Lg Electronics Inc. Method of transmitting reference signal for multi user mutliplexing in multi-antenna-based wireless communication system and apparatus therefor
US10812231B2 (en) * 2016-03-18 2020-10-20 Qualcomm Incorporated Enhanced coordinated multipoint operation
US10448408B2 (en) * 2016-08-04 2019-10-15 Samsung Electronics Co., Ltd. Method and apparatus for coordinating multi-point transmission in advanced wireless systems
CN110463128B (zh) * 2017-03-24 2022-10-18 苹果公司 用于CoMP的DM-RS分组和CSI报告
CN109391413B (zh) * 2017-08-10 2022-05-10 华为技术有限公司 信息传输的方法和通信装置
US11343037B2 (en) * 2018-02-16 2022-05-24 Qualcomm Incorporated Transmission configuration indication states with quasi-collocation groups
US20190297603A1 (en) * 2018-03-23 2019-09-26 Samsung Electronics Co., Ltd. Method and apparatus for beam management for multi-stream transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110026622A1 (en) * 2009-07-30 2011-02-03 Qualcomm Incorporated Hybrid automatic repeat request operation and decoding status signaling for uplink multiple-input multiple-output
US20120300709A1 (en) * 2010-02-11 2012-11-29 China Academy Of Telecommunications Technology Method of and apparatus for mapping to demodulation reference signal port
US20130070732A1 (en) * 2010-02-19 2013-03-21 Lg Electronics Inc. Method and apparatus for mapping a plurality of layers to a plurality of antenna ports in a wireless communication system
US20130265955A1 (en) * 2012-04-06 2013-10-10 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving channels in mobile communication system supporting massive mimo
US20150215908A1 (en) * 2012-08-31 2015-07-30 Lg Electronics Inc. Method and device for receiving downlink signal in wireless communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3641251A4 *

Also Published As

Publication number Publication date
EP3641251A4 (fr) 2021-03-10
EP3641251A1 (fr) 2020-04-22
US20200274667A1 (en) 2020-08-27
US11271695B2 (en) 2022-03-08

Similar Documents

Publication Publication Date Title
WO2018128453A1 (fr) Procédé de transmission d'un signal de référence pour une mesure de changement d'état de canal et appareil associé
WO2019240530A1 (fr) Procédé et appareil permettant la réalisation d'une communication dans un réseau hétérogène
WO2018203621A1 (fr) Procédé de transmission et de réception de dm-rs dans un système de communication sans fil et dispositif associé
WO2019017753A1 (fr) Procédé de signalement d'état de canal dans un système de communication sans fil, et appareil associé
WO2019031917A1 (fr) Procédé et dispositif d'émission ou de réception d'un signal de référence dans un système de communication sans fil
WO2018016700A1 (fr) Procédé d'émission multi-antenne en liaison montante dans un système de communication sans fil et appareil associé
WO2019194643A1 (fr) Procédé permettant de transmettre et de recevoir un canal de données de liaison descendante et appareil associé
WO2016111524A1 (fr) Procédé d'estimation d'état de canal dans un système de communication sans fil et appareil s'y rapportant
WO2018151533A1 (fr) Procédé de transmission / réception de données dans un système de communication sans fil et appareil correspondant
WO2018021865A1 (fr) Procédé de rapport d'informations d'état de canal par un terminal dans un système de communication sans fil et dispositif prenant en charge ce dernier
WO2018143654A1 (fr) Procédé pour effectuer un ordonnancement de liaison descendante d'unités de sous-bandes dans un système de communication sans fil de prochaine génération et appareil associé
WO2018230923A1 (fr) Procédé de mappage entre mot de code et couche dans un système de communication de prochaine génération, et appareil associé
WO2018147700A1 (fr) Procédé pour un terminal et une station de base, comprenant une pluralité de points d'émission et de réception (trp) pour émettre/recevoir des signaux dans un système de communications sans fil, et dispositif associé
WO2016163819A1 (fr) Procédé de déclaration d'état de canal et appareil associé
WO2017222329A1 (fr) Procédé destiné à rapporter un état de canal dans un système de communication sans fil et dispositif associé
WO2018026230A1 (fr) Procédé de rapport d'état de canal dans un système de communication sans fil et dispositif associé
WO2016144050A1 (fr) Procédé pour émettre un signal dans un système de communication sans fil, et appareil associé
WO2018084660A1 (fr) Procédé d'émission/réception de canal de commande de liaison montante physique entre un terminal et une station de base dans un système de communication sans fil et dispositif prenant en charge ledit procédé
WO2016204546A1 (fr) Procédé pour un rapport d'état de canal à l'aide d'un signal de référence d'informations d'état de canal apériodique et appareil associé
WO2013133653A1 (fr) Procédé pour rapporter des données d'état de canal dans un système de communication sans fil, et appareil associé
WO2016126063A1 (fr) Procédé de signalement d'état de canal dans un système de communication sans fil, et appareil associé
WO2016186378A1 (fr) Procédé de renvoi d'informations de signal de référence dans un système de communication sans fil à antennes multiples, et appareil associé
WO2016163847A1 (fr) Procédé d'émission ou de réception de signal de référence de sondage dans un système de communication sans fil et appareil associé
WO2016072712A2 (fr) Procédé de renvoi d'informations relatives à un canal et appareil associé
WO2018056784A1 (fr) Procédé de mesure d'interférences dans un système de communication sans fil et appareil associé

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18817768

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2018817768

Country of ref document: EP

Effective date: 20200114